Gain of the Feedback Loop Involving Carbon Dioxide and Stomata | Zendy

Graham D. Farquhar | Zendy; Dean R. Dubbe | Zendy; Klaus Raschke | Zendy

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Gain of the Feedback Loop Involving Carbon Dioxide and Stomata

Author(s) -

Graham D. Farquhar,

Dean R. Dubbe,

Klaus Raschke

Publication year - 1978

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.62.3.406

Subject(s) - carbon dioxide , loop (graph theory) , feedback loop , positive feedback , control theory (sociology) , chemistry , computer science , mathematics , engineering , artificial intelligence , combinatorics , organic chemistry , world wide web , control (management) , electrical engineering

The physiological and physical components of the feedback loop involving intercellular CO(2) concentration (c(i)) and stomata are identified. The loop gain (G) is a measure of the degree of homeostasis in a negative feedback loop [the expression 1/(1-G) represents the fraction to which feedback reduces a perturbance]. Estimates are given for the effects of G on responses of stomata and c(i) to changes in ambient CO(2) concentration, light intensity, and perturbations in the water relations of a leaf. At normal ambient CO(2) concentration, the gain of the loop involving stomatal conductance and c(i) was found to be -2.2 in field-grown Zea mays, -3.6 if plants of this species were grown in a growth chamber, and zero in well watered Xanthium strumarium in the vegetative state.

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